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0. G. BUCHANAN GRUSHING ROLLS.

N0. 420,571. Patented Feb. 4, 1890.

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(No Mode l.) v 2 Sh eets-Sheet 2. G. G. BUCHANAN. ORUSHING ROLLS.

No. 420,571. Patented Feb. 4, 1890.

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CHARLES G. BUCHANAN, OF NEV YORK, N. Y.

CRUSHlNG-ROLLS.

SPECIFICATION forming part of Letters Patent No. 420,571, dated February 4, 1890.

Application filed April 24, 1889. Serial No. 308,385 (No model.)

' of New York, county of New York, and State of New York, have invented certain new and useful Improvements in Crushing-Rolls, of which the following is a full, clear, and exact description, reference being had to the accom-,

panying drawings, and to the letters of reference marked thereon.

The object of this invention is to secure greater strength, rigidity, and simplicity of parts in the construction of ore-crushing rolls, to insure that the sliding roll shall always be parallel to the stationary roll, and to otherwise improve the rollswith the view of making them capable of performing their work with more accuracy and less wear, and so that the parts may be repaired or renewed with greater facility.

The invention embraces improved devices whereby a perfect alignment of the journalboxes is secured, whereby the sliding roll is enabled to slideback and forth when requisite for adjustment or for relief from sudden strain in a straight linefparallel to the stationary roll, and whereby itis prevented from lifting and unequal wear on its guides is prevented, and whereby the roll-shells are more rigidly secured to their centers and prevented from turning thereon; and the invention embraces other novel devices designed to further perfect the rolls and toprovide a machine accessible in every part, easily and quickly adjustable, and especially s1 rong and durable, all of which will be-her'einafter set fOlhh. V:

Reference is to be had to .the accompanying drawings, forming a part of the specification, in which similar letters of reference indicate corresponding parts in all the figures.

.Figurelisa side elevation of my improved rolls secured in a frame and ready for work, with parts broken away to exhibitiother parts. Fig. 2 is a front elevation of the same. Fig. 3 is an enlarged partly-secti0nal side elevation of a portion of the rolls. Fig. 4 is an enlarged end elevation of a roll-shell. Fig.

' 5 is an enlarged longitudinal sectional elevation of a roll-shell. Fig. 6 is an enlarged end elevation of a roll. Fig. 7 is an enlarged longitudinal sectional elevation of a roll.

In the construction of these rolls the jourrial-boxes A, provided with caps A of the stationary roll A are cast in one piece with and as an integral part of the roll-frame B.

This construction of frame and j ournal-boxes insures perfect alignment of the journals of the stationary roll and great strength and rigidity, avoids loose joints, and dispenses entirely with the. many bolts and nuts commonly used in theassembling of the frame and stationary-roll journal-boxes, and so objectionable to milling and mining men.

Occasionally when the rolls are in operation a piece of iron or steel, a broken drill or pick-point, or a bolt maybe accidentally fed to the rolls with the ore to be crushed, and it is evident that in such case one roll must recede from the other in order to avoid fracturc.

In myimproved rolls the two journal-boxes O O of the sliding roll C are cast together in one piece, their standards or bases being conne'cted by a strong heavily-ribbed cross-bar g, which is an integral portion thereof. Heavy guides f f, (best shown in Fig. 2,) for guiding the boxes O 0 in their forward or backward movements, are made integral parts of the frame B, and said boxes being set on the upper face of the franie B between the guides ff the sliding roll 0 can move to or from the stationary roll only in a line parallel to the latter. This construction and arrangement of the sliding-roll journal-boxes, aside from being stronger and more durable, dispenses with nearly all of the loose joints,

. the nuts, and bolts'common to othercrushingrolls.

The journal-boxes C O are held to the frame B by two heavy steel tensioirbolts E E, which pass through them or their bases and the said frame, and are nearly in line with the greatest strain when the rolls are in operation. About those ends of these bolts 'E E which extend beyond the front of the roll-frame are nests h h of steel springs, held in position by heavy washers h h, which in their turn are kept in place by nuts 72 h on the ends of said bolts. These springs are designed to be strong and stiff enough to resist without C0111- pression the strain resulting from the regu lar work of the rolls, and only yield under abnormal strains, as when a drill-point or other substance too hard to crush gets between the rolls. Their resisting power may be increased or diminished by screwing up or unscrewing the nuts 7L2 712, as the case may be.

The sliding roll is adjusted relativelyto the stationary roll by means of the adjustingbolts G G.

The journal-boxes C 0, provided with caps 0 are provided with strong downward-projecting lugs m m, which extend down into corresponding slots (not shown) in the frame B, and through these lugs and the rear portion of the frame B these adjusting-bolts G G are )assed horizontally and secured by nuts m m. By turning these nuts m m in one or the other direction the distance between the sliding roll 0 and the stationary roll A can be nicely adjusted while the rolls are in operation. These bolts G G serve also to counteract the tendency which all sliding rolls have of lifting in the direction of the arrow, Fig. 3, when the rolls are at work. The bolts G G also serve, in combination with the lugs 'm m, to prevent the rolls from striking together on the recoil of the sliding roll after the passage of any uncrushable foreign substance between them, and consequently to prevent the chipping of the roll-shells, which often occurs in the case of other crushingrolls because of their striking together.

My improved rolls are made with removable shells H H, as best shown in Figs. 4:, 5, and 6, cast on rings H H, of wrought or soft cast iron, which rings may be easily turned down to form suitable bearings for the rollcenter, and these shells are also cast slightly tapering inside, asindicated, that they may be more easily fitted to their centers.

From the inner face of aroll-shell near the center of its length three slotted lugs an, equidistant from each other, project inward, as best shown in Figs. 4, 5, and 6, and in assembling the parts these lugs enter into corresponding pockets 0 0, formed in the periphery of the roll-center K, as shown in Figs. 0 and 7, and serve for setting the drift-bolt against when driving the shell on the center, and they serve, also, to effectually preventthe turning of the shell on the center when the rolls are in operation. The pockets 0 0 in the roll-centers extend about half the length thereof, and from their closed ends bolt-holes o o extend out through the ends of' the said centers.

Strong bolts 1) p are passed through the shell-lugs an and the bolt-holes o 0', and are provided. with suitable nuts 1) 1). These bolts and nuts assist in drawing the shells II in place on the tapering roll centers and firmly hold them there.

The centers K are designed to be securely keyed on their respective shafts M, which latter are preferably made of wrought-steel.

The rolls when in position, as shown in Figs. 1 and 2, are provided with ahopper 0, through which the material to be crushed is fed to them.

Driving-pulleys P are fixed on the rollshafts; but an arrangement of gears may, when desired, be substituted for them.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In crushing-rolls, the combination of a slotted frame, two sliding roll-boxes cast in one piece and provided with depending lugs m on, working in the slots of said frame, adjusting-bolts G, passing through said lugs and into the frame, the adjusting-nuts m m',the tB1lSlO11-bflTS E, the springs 71., the washer h, and nuts 7L2, all substantially as shown and described.

2. A crushing roll constructed substantially as herein shown and described, consisting of internally-tapering roll-shell provided with internal bearing-rings near its edges and slotted lugs, tapering roll -eenter provided with peripheral pockets adapted to receive the shell-lugs and with bolt-holes for receiving drawing-bolts, and suitable drawing bolts and nuts, all arranged substantially as set forth.

3. The combination, with a crushing-roll shell, of interior wrought or soft cast metal rings embedded therein, and a tapering center fitting the internal diameter of said rings, substantially as and for the purposes described.

4. A crushing-roll consisting of an internal tapering roll-shell having embedded therein internal bearing-ri n gs of wrought or soft cast metal and slotted lugs, tapering roll-center provided with peripheral pockets adapted to receive the shell-lugs and with bolt-holes for receiving the drawingbolts, and suitable drawing bolts and nuts, all arranged substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand, in the presence of two witnesses, this 6th day of March, 1889.

CHARLES G. BUCHANAN.

Witnesses:

JAeoB J. Sronnn, FRANK W. MAY. 

